This
is one of the best Earth-Based Telescopic Images (EBTI) of the
Sea of Tranquility. At the far upper left where the four
craters sit on a small smooth plain, is where we want to go on a
mission to the Blair Cuspids. The second of the two larger craters is
Cayley, a 14.3 km crater situated south of the smaller crater,
Ariadaeus B. To the right of that crater is a smoother area that, under
higher resolution has some kilometer-sized craters (not visible here)
where the enigmatic objects cast their long shadows.

The area above takes in parts of four Rukl Sections. Upper left,
Section 34. Upper right, Section 35. The bottom half is a big part of
Sections 44 & 45. Lunar Orbiter II took some fantastic images in
this area in 1966 while looking for a smooth landing spot for the then
upcoming Apollo 11 mission three years later in July of 1969.
Prior to the LO imaging, Ranger 6 & 8 crashed less than 75 km NE of
Tranquility Base, and Surveyor 5 soft-landed about 30 km N, so all of
the attention and U.S. presence was to the upper right. And although we
would also like see a new mission to the area near the big crater at
top center, 26 km-with Arago, our attention is now focussed at
Ariadaeus B: The home of the Blair Cuspids.